$(i)$ Write the electron-dot structures for sodium. oxygen and magnesium.
$(ii)$ Show the formation of $Na _{2} O$ and $MgO$ by the transfer of electrons.
$(iii)$ What are the ions present in these compounds ?
$(i)$ Write the electron-dot structures for sodium. oxygen and magnesium.
$(ii)$ Show the formation of $Na _{2} O$ and $MgO$ by the transfer of electrons.
$(iii)$ What are the ions present in these compounds ?
$(i)$ The representation of elements with valence electrons as dots around the elements is referred to as electron-dot structure for elements.
$(a)$ Sodium $(2,8,1)\,=\,\overset{\centerdot }{\mathop{Na}}\,$
$(b)$ Oxygen $ (2,6)\,=\,\overset{\centerdot \,\centerdot }{\mathop{:O:}}$
$(c)$ Magnesium $(2,8,2)\,=\,\overset{\centerdot \,\,\centerdot }{\mathop{Mg}}$
$(ii)$ as per image
$(iii)$ The ions present in $Na _{2} O$ are $Na ^{+}$ and $O ^{2-}$ ions and in $MgO$ are $Mg ^{2+}$ and $O ^{2-}$ ions.
Similar Questions
Write equations for the reactions of
$(i)$ iron with steam
$(ii)$ calcium and potassium with water
Write equations for the reactions of
$(i)$ iron with steam
$(ii)$ calcium and potassium with water
You are given a hammer, a battery, a bulb, wires and a switch.
$(a)$ How could you use them to distinguish between samples of metals and non-metals ?
$(b)$ Assess the usefulness of these tests in distinguishing between metals and non-metals.
You are given a hammer, a battery, a bulb, wires and a switch.
$(a)$ How could you use them to distinguish between samples of metals and non-metals ?
$(b)$ Assess the usefulness of these tests in distinguishing between metals and non-metals.
Why do ionic compounds have high melting points ?
Why do ionic compounds have high melting points ?
Samples of four metals $A$, $B$, $C$ and $D$ were taken and added to the following solution one by one. The results obtained have been tabulated as follows.
Metal
Iron $(II)$ sulphate
Cooper $(II)$ sulphate
zinc sulphate
Silver nitrate
$A.$
No reaction
Displacement
$B.$
Displacement
No reaction
$C.$
No reaction
No reaction
No reaction
Displacement
$D.$
No reaction
No reaction
No reaction
No reaction
Use the Table above to answer the following questions about metals $A$, $B$, $C$ and $D$.
$(i)$ Which is the most reactive metal ?
$(ii)$ What would you observe if $B$ is added to a solution of Copper $(II)$ sulphate ?
$(iii)$ Arrange the metals $A$, $B$, $C$ and $D$ in the order of decreasing reactivity.
Samples of four metals $A$, $B$, $C$ and $D$ were taken and added to the following solution one by one. The results obtained have been tabulated as follows.
| Metal | Iron $(II)$ sulphate | Cooper $(II)$ sulphate | zinc sulphate | Silver nitrate |
| $A.$ | No reaction | Displacement | ||
| $B.$ | Displacement | No reaction | ||
| $C.$ | No reaction | No reaction | No reaction | Displacement |
| $D.$ | No reaction | No reaction | No reaction | No reaction |
Use the Table above to answer the following questions about metals $A$, $B$, $C$ and $D$.
$(i)$ Which is the most reactive metal ?
$(ii)$ What would you observe if $B$ is added to a solution of Copper $(II)$ sulphate ?
$(iii)$ Arrange the metals $A$, $B$, $C$ and $D$ in the order of decreasing reactivity.
Define the following terms.
$(i)$ Mineral $(ii)$ Ore $(iii)$ Gangue
Define the following terms.
$(i)$ Mineral $(ii)$ Ore $(iii)$ Gangue